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polet [3.4K]
3 years ago
12

Use the drop-down menus to complete the statements.

Biology
2 answers:
Korvikt [17]3 years ago
7 0

Answer:

In the first step of meiosis I, the chromosomes/genetic material of the cell condenses into a visible form, into a form called heterochromatin. The nucleolus also disappears.

In the second step, a process called synapsis occurs. This is when homologous chromosomes align themselves, gene by gene.

In the third step, crossing over occurs. Segments of corresponding DNA are cut and exchanged between non-sister chromatids of the formed tetrads.

In the fourth step, the nucleus fragments, the nuclear envelope fragments, the two centrosomes (if we're talking about an animal cell) separate from each other as their asters and mitotic spindles (mostly microtubules (kinetochore and non-kinetochore) lengthen. The microtubules extending from the centrosomes can now connect to chromosomes.

Nadusha1986 [10]3 years ago
7 0

Answer:

1, 4, 3, 2

explanation

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It is 41 bases (or nucleotides) long. In this example, the flanking sequences consist of 9 bases (although in reality flanking r
BigorU [14]

Answer:

49

It says that there are eight four-base repeat unites that make up the remaining 32 bases. This means that it 8 x 4 = 32. Then from 32 + 9 = 41 is how you get all of the bases in the original. However, if there were to be 10 repeat units then it would be <u><em>10</em></u> x 4 = 40. Then from there you would get 40 + 9 = 49. Hope my explanation helped somewhat.

8 0
3 years ago
Explain its normal role and why scientists would regard it as the "guardian of the genome."
Burka [1]
The gene p53, also called the guardian of the genome is located on the 17th chromosome in human genomes.
It was given this alternative name because it has a role in response to damage of DNA molecule and in preventing cancer.
The protein product of this gene stops the replication of damaged DNA, activates proteins that repair the DNA damage and if the reparation proteins fail to fix the damage it activates the process of apoptosis or so-called cell death in order to prevent the damaged cell to proliferate and potentially develop into a tumor.
5 0
3 years ago
When is the generation of an action potential impossible no matter the strength of the stimulus?
ANTONII [103]
The right answer is <span>Refractory period.

At the moment when the action potential is emitted, the fiber being depolarized, it is impossible to depolarize it again. It is, therefore, necessary to wait until the membrane potential returns to a value below the critical threshold in order to be able to excite it again. We are thus led to distinguish two periods that characterize its excitability.
An absolute refractory period: during which any stimulation, even supraliminal, is ineffective since the fiber is already depolarized.
A relative refractory period: during which a second action potential can be omitted provided that the depolarization produced by the excitation reaches the critical threshold, which implies that it is more important since the value of the resting potential has not been restored yet.</span>
7 0
3 years ago
Read 2 more answers
A cheetah, like those shown below at left, and a paramecium, like the one shown below at right, are both living things. Accordin
Natalka [10]

The correct option for this question is as follows:

a) they are made of many cells

b) they are made of one or more cells

c) they come from the same kind of cell

d) they come from noncellular structures

Answer:

The correct answer is - option b. they are made of one or more cells

Explanation:

The cell theory has three major parts that are; the cell is the basic and physiological unit of the organism, all living organisms are made up of one or more cells, new cells come from the pre-existing cells.

On the basis of the cell theory, we can say that all organisms including the cheetah that is a multicellular organism or paramecium a single-celled organism, are made up of one or more cells.

5 0
2 years ago
Where do you think you would find the most “action” on Earth in regard to crust formation?
Blizzard [7]

Answer:

fault lines

Explanation:

5 0
2 years ago
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