Cells in the thyroid gland produce and secrete thyroid hormone (a polymer of amino acids) that helps to regulate metabolism. What organelle is most likely abundant in cells of the thyroid gland?
A) mitochondria
B) rough endoplasmic reticulum
C) free ribosomes
D) lysosomes
B
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While strolling through an arboretum, a very tall tree bearing relatively small pollen-producing cones and short, needle-like leaves catches your eye. What else is also likely true of this species?
_____ It produces resin. _____ It is pollinated by moths. _____ It is a monocot. _____ Its water-conducting cells are protected from desiccation by tori. ______ Its leaf surfaces are protected from desiccation by a thick waxy cuticle.
Experiments like those first performed by Miller and Urey demonstrated that
a. amino acids and other organic compounds could form in conditions that mimicked the earth's early atmosphere. b. a lipid-protein film will eventually be formed by thermal convection. c. DNA forms readily and reproduces itself. d. complete, functioning prokaryotic cells are formed after approximately three months. e. meteorites contained organic compounds.
The "P" in P generation refers to
A. the recessive allele. B. All of the answer choices are correct. C. parental. D. potential offspring. E. pure breeding.
Energy can be _______ but not __________. Chemicals ________ the biosphere but energy __________ the biosphere.
A) converted, destroyed, flow through, is recycled in B) converted, destroyed, are recycled in, flows through C) destroyed, converted, flow through, is recycled in D) destroyed, converted, are recycled in, flows through