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Natalija [7]
3 years ago
5

I need help please could someone

Biology
1 answer:
Allisa [31]3 years ago
6 0

Answer:b

Explanation:

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The bases are paired by ____ bonds along the axis of the molecule?
Gnom [1K]

hydrogen is your answer

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2 years ago
Some toxic compounds are ingested and retained in the tissues. these pollutants pose special risks to humans and other organisms
arsen [322]

The answer is biomagnification. <span>Bioaccumulation</span> involves <span>the build-up</span> of a pollutant from the environment to an organism in a food chain. Biomagnification refers to the tendency of pollutants to concentrate as they move from one trophic level to the next. The substances become increasingly concentrated in tissues or internal organs as they move up the chain.






4 0
3 years ago
Match the genetic mutations with their names.
dusya [7]

Answer:

1. CGAGGTT → CGTT (Deletion)

2. ATTCGG → ATTCGGATTCGG (Duplication)

3. CTTAAT → TAATTC (Inversion)

4. CTTAAT → CTTAACGCT (Insertion)

5. CGAT → CTAT (Substitution)

6. CCGGTT + TTAGGC = CCGTTA + GTTGGC (Translocation)

Explanation:

1. CGAGGTT → CGTT (Deletion) ---- This is called deletion because it involves the removal of 3 base pairs (AGG) from the DNA sequence.

2. ATTCGG → ATTCGGATTCGG (Duplication) ---- In this case, the particular sequence (ATTCGG) is copied again or duplicated.

3. CTTAAT → TAATTC (Inversion)----- This is called inversion mutation because the DNA sequence breaks off and is reattached but this time in a reverse order i.e. CTT becomes TTC, placing the last base first and the first base last.

4. CTTAAT → CTTAACGCT (Insertion) ------ This is called insertion mutation because it involves the addition of extra base pairs (CGC) into the sequence. The Insertion occurs between the last A and T nucleotide.

5. CGAT → CTAT (Substitution) ----- This is called substitution because Guanine base is replaced by Thymine in the DNA sequence. It is specifically called a transversion substitution because a purine (Guanine) is replaced by a pyrimidine (Thymine). It is called a point mutation because it involves a single base.

6. CCGGTT + TTAGGC = CCGTTA + GTTGGC (Translocation) ----- in this case, CCGGTT and TTAGGC are sequences on different chromosomes. Portions of sequence on the first chromosome (GTT) and second chromosome (TTA) breaks off and gets reattached/exchanged in each other i.e. the first chromosome gets TTA while the second gets GTT. This kind of mutation is called translocation.

4 0
3 years ago
Do male or female songbirds build the nest? please show source and evidence to support your answer
hjlf

Actually it is the females the mostly build the nests the males will help build it sometimes both males and females will build it but typically it is females and that goes for all birds.

"Females typically build nests, but sometimes both parents or just the male"

5 0
3 years ago
Vitamin K is needed by the body to allow blood to dot. Most of the vitamin K in humans is produced by bacteria living in the lar
Norma-Jean [14]

Answer:

its not a or d I know that

Explanation:

In adults aged 20 and older, the average daily vitamin K intake from foods is 122 mcg for women and 138 mcg for men. When both foods and supplements are considered, the average daily vitamin K intake increases to 164 mcg for women and 182 mcg for men.

8 0
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