Which of the following layers of skin lack blood vessels?

Papillary

Epidermis

Reticular

Hypodermis

Answer and Explanation

The Correct Answer is B

The layer of skin that lacks blood vessels is the epidermis. The epidermis is the thin outer layer of the skin and does not have any blood vessels within it. It is composed of keratinized, stratified squamous epithelium and is made of four or five layers of epithelial cells, depending on its location in the body.

The other options are not correct because they do contain blood vessels. The papillary layer is part of the dermis, which contains blood vessels ¹. The reticular layer is also part of the dermis and contains blood vessels. The hypodermis is a layer below the dermis and also contains blood vessels.

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Correct Answer is A

Explanation

The sequence of bases on the complementary strand of DNA would read 5' TCGATCGCA 3'. In DNA, the nitrogenous bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The complementary strand is also antiparallel to the original strand, meaning that it runs in the opposite direction with the 5' end matching up with the 3' end of the original strand. The other options do not accurately represent the complementary sequence of bases or the antiparallel orientation of the strands.

A. A substance with a pH of 3 is two times more alkaline than a substance with a pH of 4. B. A substance with a pH of 3 is 10 times more alkaline than a substance with a pH of 4. C. A substance with a pH of 3 is two times more acidic than a substance with a pH of 4. D. A substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4.

Correct Answer is D

Explanation

A substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4. The pH scale is a logarithmic scale, which means that each change of one pH unit represents a tenfold change in the hydrogen-ion concentration. A substance with a pH of 3 has a hydrogen-ion concentration that is 10 times greater than that of a substance with a pH of 4.

A. A substance with a pH of 3 is not two times more alkaline than a substance with a pH of 4.

B. A substance with a pH of 3 is not 10 times more alkaline than a substance with a pH of 4.

C. A substance with a pH of 3 is not two times more acidic than a substance with a pH of 4.

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Which of the following layers of skin lack blood vessels?

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Naxlex Comprehensive Predictor Exams

If a portion of a strand of DNA bases reads 5' AGCTAGCGT 3', what would the sequence of bases on the complementary strand read?

Correct Answer is A

Explanation

Which of the following is correct regarding the pH scale?

Correct Answer is D

Explanation

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