Problem:OPTIONS:
- it expands
- it disappears
- it explodes
- it contracts

Answer the following question given this paragraph:   series of stages a sexually reproducing organism goes through from one generation to the next.   Q: What happens to the core of a star when it begins to run low on hydrogen?   A:
****
A: it contracts

Answer the following question given this paragraph:   Water is the solvent in solutions called acids and bases. To understand acids and bases, it is important to know more about pure water, in which nothing is dissolved. In pure water (such as distilled water), a tiny fraction of water molecules naturally breaks down, or dissociates, to form ions. An ion is an electrically charged atom or molecule. The dissociation of pure water into ions is represented by the chemical equation:.   Q: Water is the solvent in solutions called acids and?   A:
OPTIONS:
- proteins
- alkalines
- nutrients
- bases
bases

Answer the following question given this paragraph:   46.4 The interplay of tropic and sex hormones regulates mammalian reproduction.   Q: What two types of hormones regulate mammalian reproduction?   A:
OPTIONS:
- tropic and subtropic
- pheromones and enzymes
- endorphins and adrenaline
- tropic and sex

Answer: tropic and sex

Question: Answer the following question given this paragraph:   Nerve Impulse Transmission within a Neuron For the nervous system to function, neurons must be able to send and receive signals. These signals are possible because each neuron has a charged cellular membrane (a voltage difference between the inside and the outside), and the charge of this membrane can change in response to neurotransmitter molecules released from other neurons and environmental stimuli. To understand how neurons communicate, one must first understand the basis of the baseline or ‘resting’ membrane charge. Neuronal Charged Membranes The lipid bilayer membrane that surrounds a neuron is impermeable to charged molecules or ions. To enter or exit the neuron, ions must pass through special proteins called ion channels that span the membrane. Ion channels have different configurations: open, closed, and inactive, as illustrated in Figure 35.9. Some ion channels need to be activated in order to open and allow ions to pass into or out of the cell. These ion channels are sensitive to the environment and can change their shape accordingly. Ion channels that change their structure in response to voltage changes are called voltage-gated ion channels. Voltage-gated ion channels regulate the relative concentrations of different ions inside and outside the cell. The difference in total charge between the inside and outside of the cell is called the membrane potential.   Q: For the nervous system to function, neurons must be able to send and receive what?   A:
OPTIONS:
- pulses
- proteins
- information
- signals
Answer: signals

input with options: Answer the following question given this paragraph:   Nucleic acids consist of chains of small molecules called nucleotides, which are held together by covalent bonds.   Q: What holds together the small molecules called nucleotides which make up nucleic acids?   A:
OPTIONS:
- permanent bonds
- dissonance bonds
- curvature bonds
- covalent bonds
output: covalent bonds

Problem: OPTIONS:
- chloroplasts
- chromosomes
- plasma
- ribosomes
Q: Answer the following question given this paragraph:   Ribosomes are small organelles and are the sites of protein synthesis (or assembly). They are made of ribosomal protein and ribosomal RNA, and are found in both eukaryotic and prokaryotic cells. Unlike other organelles, ribosomes are not surrounded by a membrane. Each ribosome has two parts, a large and a small subunit, as shown in Figure below . The subunits are attached to one another. Ribosomes can be found alone or in groups within the cytoplasm. Some ribosomes are attached to the endoplasmic reticulum (ER) (as shown in Figure below ), and others are attached to the nuclear envelope.   Q: What are the sites of protein synthesis or assembly?   A:
Answer:
ribosomes