1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Serjik [45]
3 years ago
14

A commonly used medication to treat hypothyroidism is 

Biology
1 answer:
Firlakuza [10]3 years ago
8 0
The answer is (B. levothyroxine)
You might be interested in
If alleles of two different genes assort independently during gamete formation then what should be the phenotypic ratio in the F
Pepsi [2]

Answer:

9:3:3:1

Explanation:

If alleles of two genes separate randomly during anaphase-I of meiosis, some new combinations of the alleles are formed in the gametes. A heterozygous genotype for two loci (let's support TtRr) produces a total of four types of gametes in 1:1:1:1 ratio (TR, Tr, tR, and tr). The random fusion of these gametes from two double heterozygous parents (TtRr x TtRr) gives a phenotype ratio of 9:3:3:1. Here, 9/16 F2 progeny exhibit dominant phenotype for both loci while 1/16 exhibits recessive phenotype for both the genes. Rest 3/16 and 3/16 F2 progeny express dominant trait for one gene and recessive for the other.

6 0
3 years ago
In which plants' life cycle does double fertilization occur?
Otrada [13]
Double fertilization occurs in Angiosperms
5 0
3 years ago
Read 2 more answers
Rheumatoid arthritis is caused by: A. a bacteria B. a virus C. a reaction to an immunization D. an autoimmune reaction
Readme [11.4K]
<em>it is the inflammation of joints mostly present in hands , feet and arms ..
the cause of this disease is 
<u>D . autoimmune reaction ..</u>
</em>
4 0
2 years ago
The larger an object's mass, the
Aneli [31]

Answer:

C

Explanation:

The more massive/heavier an object is, more inertia is involved.

5 0
2 years ago
Uncontrolled Cell Growth (page 252)
KiRa [710]

The larger a cell becomes, the more demands

the cell places on its DNA. As a cell increases

in size, it usually does not make copies of

DNA. If a cell were to grow without limit, an

“information crisis” would occur. In addition, as a cell increases in size, the more trouble it has moving enough nutrients (food)

and wastes across its cell membrane. The

rate at which materials move through the

cell membrane depends on the surface area

of the cell—the total area of its cell membrane. However, the rate at which food and

oxygen are used up and waste products are

produced depends on the volume of the cell.

If a cell were a cube, you could determine surface area by multiplying length !

width ! number of sides. You could determine volume by multiplying length !

width ! height. You then could determine

the cell’s ratio of surface area to volume by

dividing the surface area by the volume. As

a cell grows, its volume increases more

rapidly than its surface area. That is, as a

cell becomes larger, its ratio of surface area

to volume decreases.

Before a cell becomes too large, a growing cell divides, forming two “daughter”

cells. The process by which a cell divides into

two new daughter cells is called cell division.

10–2 Cell Division

Each cell has only one set of genetic information. For that reason, a cell must first

copy its genetic information before cell division begins. Each daughter cell then gets a

complete copy of that information. In most

prokaryotes, cell division is a simple matter

of separating the contents of the cell into

two parts. In eukaryotes, cell division

occurs in two main stages. The first stage is

division of the nucleus, called mitosis. The

second stage is division of the cytoplasm,

called cytokinesis.

In eukaryotes, genetic information is

passed on by chromosomes. Well before cell

division, each chromosome is replicated

(copied). When copying occurs, each chromosome consists of two identical “sister”

chromatids. Each pair of chromatids is

attached at an area called a centromere.

The cell cycle is a series of events that

cells go through as they grow and divide.

During the cell cycle, a cell grows, prepares

for division, and divides to form two daughter cells, each of which then begins the cycle

again. The cell cycle consists of four phases.

The M phase includes mitosis and cytokinesis. The other three phases are sometimes

grouped together and called interphase.

Interphase is divided into three phases: G1

, S,

and G2

. During the G1 phase, cells increase in

size and make new proteins and organelles.

During the next phase, the S phase, the replication (copying) of chromosomes takes

place. When the S phase is complete, the cell

enters the G2 phase. During the G2 phase,

many of the organelles and molecules

required for cell division are produced.

Mitosis consists of four phases: prophase,

metaphase, anaphase, and telophase. The

first and longest phase is prophase. During

prophase, the chromosomes condense and

become visible. The centrioles separate and

take up positions on opposite sides of the

nucleus. Centrioles are two tiny structures

located in the cytoplasm near the nuclear

envelope. The centrioles lie in a region

called the centrosome that helps to organize

the spindle, a fanlike microtubule structure

that helps separate the chromosomes.

Summary .

During the second phase, called

metaphase, chromosomes line up across the

center of the cell. During the third phase,

called anaphase, the centromeres that join the

sister chromatids split and the sister chromatids become individual chromosomes. The

two sets of chromosomes move apart. During

the fourth and final phase, called telophase,

the chromosomes gather at opposite ends of

the cell and lose their distinct shapes. Two

new nuclear envelopes form.

Cytokinesis usually occurs at the same

time as telophase. In most animal cells, the

cell membrane is drawn inward until the

cytoplasm is pinched into two nearly equal

parts. In plant cells, a structure known as a

cell plate forms midway between the divided nuclei. A cell wall then begins to

appear in the cell plate.

10–3 Regulating the Cell Cycle

In a multicellular organism, cell growth and

cell division are carefully controlled. For

instance, when an injury such as a cut in the

skin occurs, cells at the edge of the cut will

divide rapidly. When the healing process

nears completion, the rate of cell division

slows down and then returns to normal.

Cyclins—a group of proteins—regulate

the timing of the cell cycle in eukaryotic

cells. There are two types of these regulatory proteins: internal regulators and

external regulators.

Internal regulators are proteins that

respond to events inside the cell. They

allow the cell cycle to proceed only when

certain processes have happened inside the

cell. External regulators are proteins that

respond to even

4 0
2 years ago
Other questions:
  • Are the elements in Figure 6-2 metals or nonmetals?
    9·1 answer
  • Describe each of the two paths viruses may follow once they have entered a cell.
    7·1 answer
  • How many electrons does phosphorus have in its valence shell?
    9·2 answers
  • Identify three types of internal communication that can be accomplished with an ehr
    15·1 answer
  • The physical structure of a protein often reflects and affects its function. Describe the types of chemical bonds/interactions t
    10·1 answer
  • What does the evidence suggest as a cause of the mass extinction 65 million years ago
    7·2 answers
  • This form of RNA carries the code for the production of proteins from the nucleus and to the Ribosome​
    12·1 answer
  • Which graph shows the effect of temperature between 20°C and 35°C on the activity of a human
    8·1 answer
  • Why was Darwin’s Theory of Evolution accepted when others were not?
    8·1 answer
  • PLS I need help with this
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!