________ bind two or more ions or molecules and transport them in opposite directions across a membrane.

A. Uniporters
B. Symporters
C. Antiporters
D. Dual transporters
E. Channel pumps


C. Antiporters

Biology & Microbiology

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In protostomes, into what does the blastopore develop?

a. mouth b. coelom c. anus d. germ layer

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What is a plant organ?

A. A group of cells that work together to perform a specific function B. A group of tissues that work together to perform a specific function C. A group of systems that work together to perform a specific function D. There is no such thing as a plant organ; organs are only found in animals.

Biology & Microbiology

Crosses in which F1 plants heterozygous for a given allele are crossed to generate a 3:1 phenotypic ratio in the F2 generation are known as __________

A) replicate crosses B) reciprocal crosses C) test crosses D) monohybrid crosses E) dihybrid crosses

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Sterilization, in which sperm are surgically prevented from reaching the egg, is accomplished by

A) the rhythm method. B) tubal ligation or vasectomy. C) spermicide. D) mifepristone (RU486).

Biology & Microbiology