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noname [10]
2 years ago
8

A thin, flexible, semipermeable barrier around the cell which regulates what enters and leaves the cell.

Biology
2 answers:
Mekhanik [1.2K]2 years ago
6 0
Not sure this is a question but my answer would be a semi-permeable membrane? Hope this helps! <3
timurjin [86]2 years ago
4 0
Phospholipid bilayer is the barrier that is semipermeable
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P (purple) and p (white) are the dominant and recessive alleles for flower color in peas. Similarly, A (axial) and a (terminal)
butalik [34]

Answer:

Option C, ppAa is indicative of white axial flowers.

Explanation:

It is given that Purple color (P) is dominant over white color (p). Thus in order to have a flower of white color , the flower must be homozygous recessive with an allele pair having two recessive alleles.

Similarly, Axial (A) is dominant over terminal (a) flower. Thus, a flower can be axial in two cases -

a) when both the alleles are same i.e AA

or

b) when one allele is A and the other one is a i.e Aa

Considering the above cases, all possible allele combination that will produce white axial flower are as follows -

ppAA, ppAa

Thus, option C is correct

7 0
2 years ago
Which organelle has a double membrane
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2 years ago
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4 0
3 years ago
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Hydroxylamine is a mutagen that acts only on cytosine and causes C--&gt;T and G--&gt;A base pair changes (i.e. it causes transit
natulia [17]

Options for the question are not given. They are as follows:

a. arg or lys

b. ala

c. thr

d. leu or ser

e. Only termination codons

Answer:

d. leu or ser

Explanation:

Four codons code for proline amino acid. These are CCT, CCC, CCA, and CCG. Hydroxylamine causes C to change into T or G to change into A.

If first position is changed in each codon:

CCT = TCT (UCU)

CCC = TCC (UCC)

CCA = TCA (UCA)

CCG = TCG (UCG)

These codons produce Serine amino acid.

If second position is changed in each codon:

CCT = CTT (CUU)

CCC = CTC (CUC)

CCA = CTA (CUA)

CCG = CTG (CUG)

These codons produce Leucine amino acid.

Hence, out of the given options, option d. leu or ser is correct.

7 0
3 years ago
Which of the following is considered an amphibian? 1. A bird 2. A frog 3. A goldfish 4. An iguana
mylen [45]
A frog is a amphibian. :)
7 0
2 years ago
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