The nerve net of Hydra:a
contains a central control organ and connected neurons.
b. sends electrical signals in only one direction.
c. allows the organism to respond to stimuli approaching from any direction.
d. produces a signal that intensifies as it radiates from its point of origin.
e. cannot coordinate the movement of all tentacles at once.
c
You might also like to view...
The part of a flowering plant that becomes the fruit is the ________
a. ovule b. embryo sporophyte c. zygote d. ovary
A chromosome of genotype C D recombines with a homolog of genotype c d during meiosis when Spo11 produces a double-strand break between the two loci. If anticrossover helicase disentangles the invading strand, the likely outcome would be
A) two C D and two c d gametes. B) two C d and two c D gametes. C) one C D, one C d, one c D, and one c d gamete. D) four C D gametes. E) four c d gametes
Many introduced species have deleterious effects on communities and ecosystems because ____
a. coevolved parasites and pathogens are absent b. the introduced species are long-lived c. predators prefer the introduced species, resulting in proliferation of native prey species d. the community from which they came lost an important predator, competitor, or parasite e. human beings do not know how to appreciate them
The double helix structure describes the shape of ____
a. RNA b. proteins c. three dimensional proteins d. DNA e. ribosomes