Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?

A) Recognition proteins
B) Receptor proteins
C) Connection proteins
D) Transport proteins
E) Enzymes


B

Biology & Microbiology

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Carbon-14 dating is best used for determining ages of ________

a. metamorphic rock samples 2 to 3 billion years old b. carbon-containing samples less than 100 years old c. igneous rock samples 3 to 4 billion years old d. carbon-containing samples less than 60,000 years old

Biology & Microbiology

What information is used to calculate the age-specific fertility rate, mx?

A. total number of offspring born to females within a reproductive age class B. number of female offspring born to females within a reproductive age class C. the per capita growth rate of all females D. the net reproductive rate of females E. the average age of first reproduction for females

Biology & Microbiology

Segregation is a source of variety in gametogenesis because 

A. it is during segregation that chromosomes from the parents are separated at random into the gametes. B. crossing-over during segregation mixes genes from the parents into the offspring. C. all the genes from one parent are separated from the other parents. D. new gene combinations are formed by the parent.

Biology & Microbiology

Preterm infants

Select one: a. have minimal nutritional problems. b. may have problems sucking and swallowing. c. will almost always die. d. are born with adequate mineral and fat stores.

Biology & Microbiology