Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 is a(n) ________ of oxygen-16.

A. ion
B. dimer
C. isomer
D. isotope


Answer: D

Biology & Microbiology

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Mashing is a process involving ________.

A. carbohydrate hydrolysis B. protein putrefaction C. inoculation D. carbonation

Biology & Microbiology

Which structure holds homologous chromosomes tightly together and supports them as they undergo recombination?

a. kinetochore b. centromere

c. microtubules d. spermatozoa e. synaptonemal complex

Biology & Microbiology

Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease,

a population may periodically experience a rapid and marked decrease in number of individuals, leading to a form of genetic drift called

a. a founders effect. b. migration. c. gene flow. d. natural selection. e. a genetic bottleneck.

Biology & Microbiology

Bt crops are an insect-resistant GM plant. Bt crops are used mainly because the cry proteins, which confer the insecticidal properties, are shown to ________

A) pollute the ground water B) have few negative effects on humans C) break down slowly in sunlight D) only target a few pest species

Biology & Microbiology