Answer the following question given this paragraph: As cells divide, their chromosomes get shorter. This is because the telomeres, the DNA sequences at both ends of a chromosome, lose material every time the DNA is replicated. The older the animal is, the shorter its telomeres will be, because of the number of cell cycles the cells have been through This is a natural part of aging. So, what happens to the clone if its transferred nucleus is already fairly old? Will the shortened telomeres affect its development or lifespan? The answer is still unclear. But starting a new organisms with "old" DNA with shortened telomeres is bound to have some effects, at least in some clones. Some cloned animals may be affected, others may not. Dolly the sheep's chromosomes did have shorter telomere lengths than normal. This means that Dolly's cells were aging faster than the cells from a normal sheep. Q: What happens to an animal's telomeres as it ages? Choices: - divide - lengthen - multiply - shorten A:
shorten
Answer the following question given this paragraph: Figure 23.28 Digestion and Absorption Digestion begins in the mouth and continues as food travels through the small intestine. Most absorption occurs in the small intestine. Q: Where does digestion begin? Choices: - esophogus - tongue - stomach - mouth A:
mouth
Q: Answer the following question given this paragraph: Like all living things, plants detect and respond to stimuli in their environment. Unlike animals, plants can't run, fly, or swim toward food or away from danger. They are usually rooted firmly in the soil, like the tree in Figure below . Q: Where are most plants firmly rooted? Choices: - rock - grass - mineral - soil A:
A: soil
Question: Answer the following question given this paragraph: Figure 39.14 (a) Birds have a flow-through respiratory system in which air flows unidirectionally from the posterior sacs into the lungs, then into the anterior air sacs. The air sacs connect to openings in hollow bones. (b) Dinosaurs, from which birds descended, have similar hollow bones and are believed to have had a similar respiratory system. (credit b: modification of work by Zina Deretsky, National Science Foundation). Q: Birds have a flow-through respiratory system in which air flows unidirectionally from the posterior sacs into the lungs, then into these? Choices: - posterior bronchi - gills - alveoli - anterior air sacs A:
Answer: anterior air sacs
*Question*
Answer the following question given this paragraph: The extremely hot core of the sun radiates energy from nuclear fusion. Q: How does the core of the sun radiate energy? Choices: - nuclear fission - carbon radiation - electrical radiation - nuclear fusion A:
**Answer**
nuclear fusion
Q: Answer the following question given this paragraph: Molecular orbital theory describes the distribution of electrons in molecules in much the same way that the distribution of electrons in atoms is described using atomic orbitals. Using quantum mechanics, the behavior of an electron in a molecule is still described by a wave function, , analogous to the behavior in an atom. Just like electrons around isolated atoms, electrons around atoms in molecules are limited to discrete (quantized) energies. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital (2). Like an atomic orbital, a molecular orbital is full when it contains two electrons with opposite spin. We will consider the molecular orbitals in molecules composed of two identical atoms (H2 or Cl2, for example). Such molecules are called homonuclear diatomic molecules. In these diatomic molecules, several types of molecular orbitals occur. The mathematical process of combining atomic orbitals to generate molecular orbitals is called the linear combination of atomic orbitals (LCAO). The wave function describes the wavelike properties of an electron. Molecular orbitals are combinations of atomic orbital wave functions. Combining waves can lead to constructive interference, in which peaks line up with peaks, or destructive interference, in which peaks line up with troughs. Q: Which theory describes the distribution of electrons in molecules in much the same way that the distribution of electrons in atoms is described using atomic orbitals? Choices: - molecular distribution theory - atomic orbital theory - atomic distribution theory - molecular orbital theory A:
A: molecular orbital theory