All categories

3 years ago

Ch. 23 Cnidarian Diversity: Polyps QUESTIONS

Biology

1 answer:

Reptile [31]3 years ago

6 0

Answer:

The digestive tract of cnidarians consists of only of an orifice and a gastrovacular cavity (the coelenteron or blind gut)

Explanation:

Cnidarians are a group of simple organisms whose habitat is predominantly aquatic, such as sponges and jellyfish. They are diblastic organisms -as they are formed from two embryonic leaves, the ectoderm and gastroderm- and radial symmetry, with an incipient nervous system.

One of the main characteristics of Cnidarians is that they have a single orifice that communicates the exterior with the single cavity that forms the coelenteron, or gastrovascular cavity, which together form their digestive and excretory tracts. While in the cavity occur the processes of absorption of nutrients, distribution of them throughout the body and disposal of waste (vascular function), the single orifice acts as a mouth and anus.

You might be interested in

Match the following vocabulary words with the correct definitions.

geniusboy [140]

Explanation:

$\longmapsto \: \red[ \underline{\boxed{\frak{hello }}}$

Answer:

1. decomposing through the action of bacteria

2.Rhizobium

3. Evaporation

4. precipitation

5. condensation

6. gosh plant

3 0

2 years ago

Design your own scenario related to Bacteria or Viruses. Identify the independent and dependent variables.

timurjin [86]

Answer:

An experiment where an antibiotic is tested against bacteria. The antibiotic can vary in its concentration for example, different amounts are applied to a sample of bacteria to see if it is affected by the action of the antibiotic and if so, in what concentration. So, the independent variable is the concentration of antibiotic while the dependent variable is the survival (or not) of the bacteria.

Explanation:

An independent variable is a variable that represents a quantity that the scientist modifies in an experiment. A dependent variable represents a quantity whose value depends on how the independent variable is modified. This is the variable being studied and measured.

So, an example of this applied to bacteria or viruses could be:

An experiment where an antibiotic is tested against bacteria. The antibiotic can vary in its concentration, different amounts are applied to a sample of bacteria to see if it is affected by the action of the antibiotic and if so, in what concentration. So, the independent variable is the concentration of antibiotic while the dependent variable is the survival (or not) of the bacteria.

To complete the experiment, an antibiotic whose effect is already known can be used as a positive control. That is, it is already known to kill the bacteria. And as a negative control you can simply use water, which has no effect and is known not to kill the bacteria. In this way, we validate the results and make sure that there is not something else that is affecting the bacteria and that only the antibiotic being studied has an influence.

5 0

3 years ago

each pair of electrons is passed down the chain, dropping in _____ needed for active transport of H+ ions against their _____.

Travka [436]

Answer:

Dropping in energy levels

Against their concentration gradient

Explanation:

The pair of electrons are passed down a series of electron carriers of progressively lower energy levels through a series of redox reactions in the electron transport chain, releasing energy (electrical potential energy) to be used by H+ pump for the active transport of H+ ions (aka protons) from a region of higher concentration to a region of lower energy level against its concentration gradient.

8 0

3 years ago

In what situation does the cell get larger

iris [78.8K]

The answer should be hypotonic solution

4 0

3 years ago

Which of the following characteristics are associated with transformed cells? Check All That Apply decreased growth ratedecrease

castortr0y [4]

Answer:

b. Altered chromosomes.

c. Changes in cell surface molecules.

e. Integration of viral deoxyribonucleic acid (DNA) into host chromosome.

Explanation:

A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature.

A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.

Generally, cells have the ability to independently replicate themselves.

In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles. Some examples of cell organelles found in all living organisms such as trees, birds, and bacteria include; nucleus, cytoplasm, cell membrane, golgi apparatus, mitochondria, lysosomes, ribosomes, chromosomes, endoplasmic reticulum, vesicles, etc.

Transformed cells refer to cells that have undergone genetic alterations and as such do not experience normal cell processes or characteristics such as differentiation, division, and growth.

The characteristics which are typically associated with transformed cells include the following;

I. Altered chromosomes. Chromosomes are found in the cell nucleus and are comprised of deoxyribonucleic acid (DNA), histone proteins, etc. Thus, they are used to store genetic informations in living organisms.

II. Changes in cell surface molecules.

III. Integration of viral deoxyribonucleic acid (DNA) into host chromosome.

8 0

3 years ago