Biology Questions
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The layer of follicle cells that surround the unfertilized egg is called the
The ________ is formed by the allantois, blood vessels, and yolk sac.
The process that divides different portions of the zygote's cytoplasm among blastomeres is called __________.embryogenesisfertilizationplacentationcleavage
During amphimixis,the ovum finishes meiosis II.sperm become haploid.meiosis occurs.the male and female pronuclei fuse.gametes are formed.
The cell that directly results from the fusion of a secondary oocyte and a single sperm is called a(n)
After fertilization, the first cell division is completedwithin a few seconds.about 6 hours later.in 12 hours.within the hour.about 30 hours later.
The period of gestation when organs and organ systems complete most of their development and the fetus looks distinctly human is the ________ trimester.
The site where fertilization normally occurs is in theunion of the vagina and uterus.uterine wall near the fundus.fimbrae.outer one-third of the uterine tube.cervix.
Unique features of vertebrates include the presence of a ___. A endoskeleton B notochord C skull and backbone D pharyngeal slit E true coelom
Which animals have a cylindrical body that is tapered at both ends? A molluscs B annelids C cnidarians D roundworms E platyhelminthes
___ are the most diverse group of arthropods. A millipedes B arachnids C crustaceans D insects E centipedes
Nearly all ___ are aquatic. A centipedes B millipedes C crustaceans D insets E arachnids
A ___ is an example of a mollusc that does not have a shell. A snail B squid C oyster D octopus E clam
Which of these exhibits radial symmetry? A) butterfly B) shoe box C) ferris wheel D) automobile E) spoon
What characteristic is unique to echinoderms? A a lack of segmentation B larvae with bilateral symmetry C suction cup like feet D a water vascular system E a true coelom that forms the digestive tube
Natural selection can be defined as ___. A) the production of more offspring than can survive in a given environment B) the evolution of a population of organisms C) a process in which organisms with certain inherited traits are more likely to survive and reproduce than individuals with other traits D) a process in which organisms with certain inherited traits are more likely to survive and reproduce than other individuals
The arthropod skeleton is composed of ___ A salicylic acid B glycogen C peptidoglycogen D cellulose E chitin
There are more species of ___ than any other type of animal. A annelids B nematodes C molluscs D chordates E arthropods
How do sponges differ from all other animals? A sponges are autotrophs B sponges lack a true body cavity C sponges exhibit radial symmetry D sponges lack true tissues E sponges have a true coelom
Which of the following is a characteristic of all chordates? A they all exhibit radial symmetry B they all have a notochord sometime during the life cycle C they all have an endoskeleton sometime during the life cycle D they all have a pseudocoelom E they all have vertebral columns