Which structural characteristic is seen in RNA but not in DNA?

o double strands

o a single strand

O chains of nucleotides

O a helical shape

Gregor Mendel studied pea plants to determine the patterns of inheritance. What is not a reason Mendel used pea plants in his experiments? Check all that apply

Which of the body's systems directs and coordinates the interrelated activities of the gastrointestinal tract? Which of the body's systems directs and coordinates the interrelated activities of the gastrointestinal tract?

Which of these species is most closely related to Felis rufus?

The Sun is millions of kilometers away. How can heat from the Sun get there?

Sensory receptor cells convert a stimulus, such as an odor molecule or light, into an electrical signal that is conveyed to the nervous system. This process is called:

Describe one way the human respiratory system degrades over our lifespans, and explain one environmental condition that could cause an unnatural degradation as someone ages, including why that environmental condition harms their respiratory system.

Which is the mechanism by which improper excision of a prophage from a bacterial chromosome results in packaging of bacterial genes near the integration site into a phage head?

The tundra biome has extremely cold temperatures during much of the year and a hard sublayer of permanently frozen soil called permafrost. Which of the following adaptations would plants in the tundra most likely have? A.

When plants of a particular species are growing too close to each other, crowding may eventually lead to mortality, known as self-thinning. this type of mortality is density-dependent. oscillating. exponential. density-independent. random?

the plant can either have a dominant allele or a recessive allele what would be a reason that is not a hardy weinberg equilibrium