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Darina [25.2K]
3 years ago
13

A human activity that could significantly decrease the 5) amount of carbon dioxide in the air is

Biology
1 answer:
mote1985 [20]3 years ago
5 0

Answer: afforestation

Explanation:by planting trees they would be able to "inhale "the carbon iv oxide and in exchange exhale Oxygen

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What occurs to a DNA strand during DNA replication?
Murrr4er [49]

Answer:

It is copied.

Explanation:

Replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules.

7 0
2 years ago
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Hydroxylamine is a mutagen that acts only on cytosine and causes C-->T and G-->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
What fertility technique extracts ova, combines them with sperm, and after a few days, implants two or three blastocysts into th
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<span>In vitro fertilization
       
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Why would the guard cells have chloroplasts when the other skin cells of leaf does not have chloroplasts?
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3 years ago
1)Which of the following describes how infectious agents in the environment would most likely affect one’s personal health?
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<span>1. c) Exposure would weaken the body’s immune system and leave it unable to fight future infections.
</span>2. <span>c) Excess amounts are removed by the kidneys and excreted along with urine.</span>
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3 years ago
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