in which solution will a cell lose water and shrink (high concentration of sodium outside cell)
hypertonic solution
what essential substance do all living things need to live?
water
which cell division organelle is found in animals but not plants?
centriole
in which type of solution will a cell gain water and possibly burst (higher sodium concentration inside cell)
hypotonic solution
which structural feature distinguishes RNA from DNA?
the base of uracil (U) instead of thymine (T)
which genotype shows an organism that has 2 identical dominant alleles for a single trait?
homozygous dominant
how are the genotype and phenotype of an organism related?
the genotype codes for the potential phenotype
what molecule is produced from a DNA template during protein synthesis?
messenger RNA molecule
scientific term that describes the wide range of different species and ecosystems found on Earth
biodiversity
a rainforest would have (1) biodiversity compared to a (2) desert.
(1) higher (2) lower
fitness means being (A) to survive and (B) in a particular environment
(A) adapted (B) reproduce
natural selection can lead to new (A) migrations to new environments, or (B) of weaker species
(A) adaptations (B) extinction
why does increased competition from environmental stress speed up natural selection?
increases ‘struggle for existence’
a fast growing plant using up soil is an example of
indirect competition
cheetahs and hyenas fighting over captured prey is an example of
direct competition
a vine and a tree both growing toward sunlight is an example of
interspecific competition
gene flow
transfer of genetic material between populations due to migration
organisms migrate when
resources become scarce
a species becomes extinct when
its unable to adopt to environmental changes
What direction does water always move in Omosis
Lower to Higher concentration of sodium
somatic cells
cells that make up individual’s body
gamete cells
sex cells
zygote
a single cell resulting from gamete fusion (during sexual reproduction)
what is genetic recombination?
process where DNA from two parents combines to produce offspring during sexual reproduction
