Uracil pairs with(1 point)

Question

A. adenine.
B. any nitrogen base.
C. uracil.
D. thymine.

Answer 1

A. adenine.

Answer 2

The amino acid serine is coded by the mRNA codon AGU. What is the base sequence of the DNA gene that originally produced this mRNA codon?(1 point)
Responses

UCA
UCA

AGU
AGU

TCA
TCA

TCC

Answer 3

The base sequence of the DNA gene that originally produced the mRNA codon AGU is:

TCA

This is because the mRNA is transcribed from the DNA template strand, and the complementary DNA base pairs to the mRNA codon must be determined. In this case, the mRNA codon AGU pairs with TCA in DNA.

Answer 4

Consider the following chromosomes and if they are affected by hemophilia.

X = unaffected X chromosome, x = X chromosome affected by hemophilia, and Y = Y chromosome.

If an Xx female and XY male have children, what fraction of their offspring will have an affected chromosome, and what fraction is likely to be affected by hemophilia?

(1 point)
Responses

12
and 14
1 half and 1 fourth

14
and 14
1 fourth and 1 fourth

14
and 12
1 fourth and 1 half

12
and 13

Answer 5

To determine the inheritance of hemophilia in an Xx female and an XY male, we can set up a Punnett square to observe the possible genetic combinations for their children.

The parents are:

• Female: Xx (unaffected carrier)
• Male: XY (unaffected)

The possible gametes are as follows:

• Female can produce gametes: X or x
• Male can produce gametes: X or Y

Setting up the Punnett square, we have:

| | X (father) | Y (father) | |-------|------------|------------| | X (mother) | XX | XY | | x (mother) | Xx | xY |

Now, let's evaluate the offspring:

• XX: unaffected female
• XY: unaffected male
• Xx: unaffected female carrier
• xY: affected male (hemophilia)

From this, we see:

• 2 potential offspring are unaffected (XX and XY)
• 1 potential offspring is an unaffected carrier (Xx)
• 1 potential offspring is affected (xY)

Thus, the fractions are:

• 1 out of 4 (1/4) of the offspring will have the affected chromosome (xY).
• 1 out of 4 (1/4) of the offspring will be affected by hemophilia (xY).

Therefore, the answer is:

1 fourth and 1 fourth.

Answer 6

Select the statement that is true.(1 point)
Responses

DNA has the sugar deoxyribose, while RNA has the sugar ribose.
DNA has the sugar deoxyribose, while RNA has the sugar ribose.

Translation copies DNA to mRNA, while transcription converts mRNA into proteins.
Translation copies DNA to mRNA, while transcription converts mRNA into proteins.

DNA and RNA are both double-stranded.
DNA and RNA are both double-stranded.

Thymine is only present in DNA, while cytosine is only present in RNA.
Thymine is only present in DNA, while cytosine is only present in RNA.

Answer 7

The true statement is:

DNA has the sugar deoxyribose, while RNA has the sugar ribose.

The other statements are false:

• Translation does not copy DNA to mRNA; that process is called transcription. Translation converts mRNA into proteins.
• DNA is double-stranded, while RNA is usually single-stranded.
• Thymine is only present in DNA, but cytosine is present in both DNA and RNA.

Answer 8

What role does tRNA play in the translation process?(1 point)
Responses

tRNA carries amino acids to the ribosome and helps form proteins.
tRNA carries amino acids to the ribosome and helps form proteins.

tRNA holds the "stop" codon to alert ribosomes to end protein production.
tRNA holds the "stop" codon to alert ribosomes to end protein production.

tRNA bonds the amino acids together to then form proteins.
tRNA bonds the amino acids together to then form proteins.

tRNA converts DNA into mRNA.

Answer 9

The correct response is:

tRNA carries amino acids to the ribosome and helps form proteins.

tRNA (transfer RNA) is responsible for bringing the appropriate amino acids to the ribosome during the translation process, facilitating the assembly of the amino acids into a protein according to the sequence of the mRNA.