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lana [24]
4 years ago
8

Help fast

Biology
2 answers:
WITCHER [35]4 years ago
6 0

Answer:B.

an organism's cells and systems

Explanation:

tamaranim1 [39]4 years ago
3 0

Answer:b

Explanation:

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If the ecosystem is balanced, which populations should be the largest? Which should be the smallest?
asambeis [7]
The largest population would be the producers. In an energy pyramid, the producers have the largest biomass. The smallest population would be the top predators, since there isn’t enough energy to sustain this level in the energy pyramid.

5 0
3 years ago
Will mark brainliest!
saw5 [17]

Answer: The combination produced is RRtt.

The combination rrTt does not appear in this punnett square.

Explanation:

As the problem does not indicate more information, I assume that punnett square is made between two RRtt genotypes. It can produce gametes that have the alleles Rt. A gamete is a sexual cell (egg or sperm) that has only one allele of each gene. And, each gamete codes for a different gene. Since here we have two different types of alleles (R and t), it is a dihybrid cross.

<u>A Punnett square is a diagram used to predict the genotypes of a cross or breeding experiment.</u> It is used to determine the genotypes and phenotypes of the offspring. To do it, you have to label the rows with one parent's gametes and label the columns with the other parent's genotype. Then, have each box inherit letters from its row and column, and interpret the results.

Then, the punnett square (shown in the picture) will be between RRtt and RRtt whose gametes can only be Rt, so Rt x Rt will be made.

The result in an offspring which will be 100% RRtt, and there is no rrTt combination here because non of the parents have an r allele, then none of the children can inherit it.

To have an offspring where rrTt genotype is shown, a different genotype must be used, in which both parents must have at least one r allele and one t allele. For example, it could be Rrtt x rrTt.

5 0
3 years ago
How do mutations create such diferences in ones phenotypes and specific characteristics withought mutations getting out of contr
ipn [44]
There is a change in amino acids sequence causes these mutations, If there is an error in the order of amino acids during the process of multiplication, there is a special enzyme to repair errors 
3 0
3 years ago
Contact forces result from the physical push or pull of an object<br><br> true or false
olga_2 [115]
True - The weight of an object is equal to the force of gravity acting upon the object. .... A contact force results from the physical contact between two objects.
6 0
3 years ago
When NADH is the electron donor to the respiratory chain, 2.5 ATP are formed, but when FADH2 is the electron donor, only 1.5 ATP
Fofino [41]

Answer:NADH donates it electron to complex I a higher energy level than other complexes while FADH donates it electron to complex II a lower energy complex.

Explanation:

Both NADH and FADH are shuttle of high energy electrons originally extracted from food into the inner mitochondrial membrane.

NADH donate it electron to a flavoprotein consisting of FMN prosthetic group and an iron-sulphur protein in ETC complex-I. Two electrons and one hydrogen ion are are transferred from NADH to the flavin prosthetic group of the enzyme.

While the electrons from FADH2 enters the ETC (electron transport chain) at the level of co-enzyme Q (complex II). This step does not librate enough energy to act as a proton pump.

So NADH produces 2.5 ATP during the ETC and oxidative phosphorylation because it donates its electron to Complex I, which pump more electrons across the membrane than other complexes.

5 0
3 years ago
Read 2 more answers
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