Which one of the following cell organelles contains RNA? 

A. ribosome
B. endoplasmic reticulum
C. Golgi body
D. centriole


A. ribosome

Biology & Microbiology

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One of the reasons why the model systems of yeast, Arabidopsis, nematode worms, fruit flies, and mice are so often used to study functional analysis of genes is because 

A. they all have only a few chromosomes. B. they are easy to cross with each other and observe polyploidy effects. C. they have short life cycles. D. they are easy to observe in the wild. E. they mutate easily leading to new genomic variations.

Biology & Microbiology

An interaction in which one species benefits and the second species is neither harmed nor benefited is known as ____

a. mutualism b. parasitism c. commensalism d. competition e. predation

Biology & Microbiology

Plants have evolved non-reproductive traits such as fragrance and flower characteristics compatible with the attributes of their __________.

A. pollination vector B. calyx C. predator D. herbivore E. carpel

Biology & Microbiology

The main form of glucose repression in the lac operon is

A. repression. B. the CAP/cAMP system. C. induction. D. inducer exclusion.

Biology & Microbiology