Which statement describes a primary mutant screen?
A) A researcher uses CRISPR to create mutations in mouse homologs of three genes that function in heart development in the fruit fly.
B) A scientist uses RNAi to simultaneously knock down the expression of two genes in C. elegans to determine whether they function redundantly.
C) A scientist examines a large number of mutagenized zebrafish embryos for abnormalities in blood vessel formation.
D) A researcher treats a large number of Arabidopsis plants with different chemicals to determine which chemicals inhibit plant growth.
C) A scientist examines a large number of mutagenized zebrafish embryos for abnormalities in blood vessel formation.
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In the respiratory tract, ciliated cells constantly sweep mucus that contains trapped foreign matter
a. True b. False
This type of RNA is typically found as a strand about 75?90 bases long that folds into a structure with
four double-helical segments.
a. snRNA b. pre-mRNA c. rRNA d. tRNA e. mRNA
A stroke may occur when
a. a vessel in the brain ruptures. b. a vessel in the heart ruptures. c. a vessel in the brain is blocked by a clot. d. a vessel in the heart is blocked by a clot. e. a vessel in the heart ruptures, and a vessel in the brain is blocked by a clot
The oldest known anthropoid fossil is ____, found in China and Myanmar
a. Eosimias b. Branisella c. Ardipithecus d. Dryopithecus e. Aegyptopithicus