By the time of birth, the human body contains

approximately



a. a thousand cells.
b. a million cells.
c. a billion cells.
d. a trillion cells.
e. a quadrillion cells


D

Biology & Microbiology

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The basic reproduction number of a pathogen

A) can vary during an epidemic based on infection control measures. B) can be determined experimentally in the lab. C) is usually high for pathogens that are transmitted through direct contact. D) can be determined experimentally and is usually high for pathogens that are transmitted through direct contact.

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In cases of the "winter blues" treatment with a

bright artificial light can reduce the effects by a. increasing thyroid gland activity. b. decreasing pineal gland activity. c. increasing gonadal output. d. pancreas reduction. e. kidney adrenal gland activation

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The genes of a single operon are all regulated by the same repressor, operator, and promoter.

Answer the following statement true (T) or false (F)

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An atom has four electrons in its valence shell. What types of covalent bonds is it capable of forming?

A) single, double, or triple B) single and double only C) single bonds only D) double bonds only

Biology & Microbiology