Edouard van Beneden proposed that an egg and a sperm, each containing half the complement of chromosomes found in somatic cells, fuse to produce a single cell called a(n) ________.
A. embryo
B. oocyte
C. karyotype
D. zygote
Answer: D
You might also like to view...
What mechanism is used by a bacterial cell to fit its DNA into the nucleoid region?
A. the formation of loop domains B. supercoiling by topoisomerases C. tight wrapping around histones to form nucleosomes D. the formation of loop domains and supercoiling by topoisomerases E. the formation of loop domains, supercoiling by topoisomerases, and tight wrapping around histones to form nucleosomes
Scientists develop a chemical that binds to molecules that make quorum sensing possible, rendering those molecules non-functional. If this chemical is incorporated into a mouthwash, how would it affect the community of bacteria that cause dental plaque?
A. Their negative effects would be reduced because they will no longer be able to produce mucilage and stick to teeth. B. Their negative effects would be reduced because they will no longer be able to produce the acid that damages teeth. C. Their negative effects would be increased because it will cause them to produce mucilage, allowing them to stick to teeth. D. Their negative effects would be increased because it will cause them to produce the acid that damages teeth. E. It would have no effect because they will still be able to form a biofilm and secrete the acid that damages teeth.
Cnidarians are __________, meaning they have two tissue layers
A. diploid B. protostomes C. diploblastic D. bilateral E. hermaphroditic
Tay-Sachs disease is a human genetic abnormality that results in cells accumulating and becoming clogged with very large, complex, undigested lipids. Which cellular organelle must be involved in this condition?
A) the endoplasmic reticulum B) the Golgi apparatus C) the lysosome D) mitochondrion