Which is a basic method of cell-to-cell communication?

a. mechanical signals

b. nerve and blood-transported signals

c. cytoplasmic transfer of signals

d. diffused chemical signals

e. contact-dependent signals?

What is special about a radioactive cat?

Which are examples of abiotic factors? Check all that apply. sunlight oxygen rotting leaves stones fungi

Why are glass cylinders preferred over plastic cylinders for conducting lab experiments? a. they are attractive and light b. they are cheap and abundant c. they are heat and chemical resistant

Scientists have proven the weakening of the ozone layer. True False

The chromosome # 2 in humans is an example of evolution of the genome because following the divergence of humans and chimpanzees from a common ancestor, two ancestral chromosomes fused in the human line.

Which of the following substances would NOT be found in significant amounts in the extracellular matrix of the illustrated areolar connective tissue? A. collagen B. elastin C. keratin D. proteoglycan

What could be one possible effect on human health due to an oil spill? A. Greenhouse gases being emitted into our atmosphere from the vessel can have a negative impact on our air quality. B.

What condition would an increase in bicarbonate ion lead to?

The dental formula 2-1-2-3 corresponds to what order of teeth? a. molars, premolars, canines, incisors b. incisors, canines, premolars, molars c. canines, premolars, incisors, molars d. premolars, molars, incisors, canines

What occurs when bonds are broken and new bonds are formed