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viva [34]
3 years ago
5

Which of the following are true of enzymes?

Biology
1 answer:
MAVERICK [17]3 years ago
5 0

Answer:

Enzymes raise the activation energy of a reaction

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How does the structure of cholesterol enable it to perform structural and functional roles within membranes
puteri [66]
Cholestrol streghtens the cell memebrane. Its STRUCTURE gets fixed in the cell membrane and then performs its FUNCTIONS that is to strengthen the cell membrane
3 0
3 years ago
This is one possible cross (above) for the X-linked condition known as hemophilia. Which pair of parents is most likely to have
gtnhenbr [62]

Answer:

The options:

A. A hemophiliac mother and an unaffected father

B. A carrier mother and an unaffected father

C. A carrier mother and a hemophiliac father

D. An unaffected, non-carrier mother and a hemophiliac father

The CORRECT ANSWER IS C.

C. A carrier mother and a hemophiliac father

Explanation:

Hemophilia is known to be a recessive disorder, a woman would need to have two disease alleles (positioned on both X chromosome) for the disease to be expressed. Therefore, she would need to possess the disease allele from both parents (mother and father).

Hemophilia is an X-linked disorder, and it is hemizygous for male in terms of the hemophilia-related gene (with only a singular allele and express the phenotype linked with the allele). For the hemophilia allele to be inherited in an offspring, the male has to be hemophiliac.

Pairs of parents without a hemophiliac male would not have a hemophiliac daughter, excluding rare conditions (spontaneous mutations occuring in the germline or at growth and maturation of the embryo).

A homozygous woman for this condition (is hemophiliac) or heterozygous woman for the allele in consideration (is an unaffected carriers) could transfer a hemophilia allele to her offspring.

Pairs of parents that without a hemophiliac female or hemophiliac carrier would not yield a hemophiliac daughter (with the exclusion of rare spontaneous mutation situations).

Of the pairs above, a carrier mother and a hemophiliac father would most probably produce a hemophiliac daughter.

4 0
3 years ago
Read 2 more answers
Which of the following is not a step in the process of natural selection
Paraphin [41]

Answer:

A step that is not part of natural selection is people select which individuals breed and which ones do not.

Explanation:

Natural selection is a process in which favorable or unfavorable environmental conditions determine the evolution of species, producing differences in their genotype over a long period of time.

As its name indicates, it is a natural selection, in which no intervention by people is contemplated, so that <u>people cannot determine which individuals breed</u>.

Natural selection implies that the characteristics on which the environment influences are inheritable, that there is genetic variability in the population and that the variability of these characteristics implies the ease of reproduction and survival capacity.

<em>The other options do form part of natural selection, since they are based on the three premises of this process: </em>

  • <em>Inheritable characteristics. </em>
  • <em>Genetic variability. </em>
  • <em>The variability of characteristics influences reproduction and survival.</em>
4 0
3 years ago
What does endocrine system regulate? A) blood flow B) voluntary muscle impulses C) involuntary muscle contractions D) hormone an
Margarita [4]

Answer:

D. Hormone and glandular secretiona

4 0
2 years ago
What is the most likely explanation for the smaller size of the hypoxic zone in the year 2000?
Irina-Kira [14]
Due to the reduction in large industrial emmissions such as fertilizers into water zones. 
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