Which organisms are most critical in the nitrogen cycle?

1 answer:

8 0

These are the things that convert nitrogen in the soil -cyanobacteriaparticipate. After nitrogen has been fixed, other bacteria convert it into nitrate, in a process known as nitrification.

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In eukaryotic cells, the mRNA is processed and migrates from the _________ to the _________.

HACTEHA [7]

The DNA replicates it’s information in a process involving many enzymes. The DNA code for production of messenger is RNA. I’m eukaryotic cells, the MRNA is processed and migrates from the nucleus to the cytoplasm.

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4 0

3 years ago

Which part of the cell stores waste until it can be removed?

zavuch27 [327]

Answer: Vacuole

Answer choices:

Cell membrane
Mitochondrion
Nucleus
Vacuole

Vacuoles are membrane-bound structures found in both animal and plant cells.

They have three important functions in plants -- provide support or rigidity, a storage for nutrients and waste matter until it can be removed, and decompose complex molecules.

8 0

3 years ago

The number of major histocompatibility (MHC) protein combinations possible in a given population is enormous. However, an indivi

attashe74 [19]

Answer:

The correct answer is "each of the MHC genes has a large number of alleles, but each individual only inherits two for each gene".

Explanation:

In normal conditions, an individual has only two different alleles for a given gene: one inherited from his mother and the other from his father. However, this does not mean that among humans, there are only two different alleles for each gene. The major histocompatibility (MHC) genes are a clear example of this, since there are multiple combinations for each MHC class. For instance, there are 40 very similar alleles only for the HLA-B27 subtype.

6 0

3 years ago

PKU (Phenylketonuria) is an autosomal recessive disease, in which the synthesis of amino acid Tyrosine from Phenylalanine is blo

sveticcg [70]

The answer is; C

Use the Hardy Weinberg equiation for population in assumed equilibrium. ( p+q = 1)

If p = 0.3 then q=1-p = 1-0.3 = 0.7

People who are heterozygous for the disease are represented by 2pq = 2 * 0.3 * 0.7

0.42

5 0

3 years ago

In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If a red-eyed heterozygous f

ladessa [460]

The answer is Rr and rr.

We know:
r - recessive allele
R - dominant allele
RR - dominant homozygote with red eyes
Rr - heterozygote with red eyes (since one dominant allele R can mask recessive allele r)
rr - recessive homozygote with sepia eyes

Heterozygote Rr can give to the offspring either dominant allele R or recessive allele r. Recessive homozygote rr can give to the offspring only recessive allele r (take a look at the uploaded image of Punnett square).
After crossing the parents:
Parents: Rr x rr
Offspring: Rr rr Rr rr

So:
2 out of 4 offspring will be with heterozygous with red eyes Rr: 2/4 = 0.5 = 50%
2 out of 4 offspring will be with homozygous with sepia eyes rr: 2/4 = 0.5 = 50%

8 0

3 years ago

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