________ 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
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In protostomes, into what does the blastopore develop?
a. mouth b. coelom c. anus d. germ layer
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.
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
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).