Q: What does ubiquitin indicate about a protein's lifespan? Read this paragraph and choose the correct option from the provided answers: Sometimes these modifications can regulate where a protein is found in the cellfor example, in the nucleus, the cytoplasm, or attached to the plasma membrane. Chemical modifications occur in response to external stimuli such as stress, the lack of nutrients, heat, or ultraviolet light exposure. These changes can alter epigenetic accessibility, transcription, mRNA stability, or translationall resulting in changes in expression of various genes. This is an efficient way for the cell to rapidly change the levels of specific proteins in response to the environment. Because proteins are involved in every stage of gene regulation, the phosphorylation of a protein (depending on the protein that is modified) can alter accessibility to the chromosome, can alter translation (by altering transcription factor binding or function), can change nuclear shuttling (by influencing modifications to the nuclear pore complex), can alter RNA stability (by binding or not binding to the RNA to regulate its stability), can modify translation (increase or decrease), or can change post-translational modifications (add or remove phosphates or other chemical modifications). The addition of an ubiquitin group to a protein marks that protein for degradation. Ubiquitin acts like a flag indicating that the protein lifespan is complete. These proteins are moved to the proteasome, an organelle that functions to remove proteins, to be degraded (Figure 16.14). One way to control gene expression, therefore, is to alter the longevity of the protein. Choices: - initiation - transaction - reaction ratio - completion A:
completion

(Question)
Q: Light waves differ based on their frequency and what else? Read this paragraph and choose the correct option from the provided answers: 36.5 Vision Vision is the only photo responsive sense. Visible light travels in waves and is a very small slice of the electromagnetic radiation spectrum. Light waves differ based on their frequency (wavelength = hue) and amplitude (intensity = brightness). In the vertebrate retina, there are two types of light receptors (photoreceptors): cones and rods. Cones, which are the source of color vision, exist in three formsL, M, and Sand they are differentially sensitive to different wavelengths. Cones are located in the retina, along with the dim-light, achromatic receptors (rods). Cones are found in the fovea, the central region of the retina, whereas rods are found in the peripheral regions of the retina. Visual signals travel from the eye over the axons of retinal ganglion cells, which make up the optic nerves. Ganglion cells come in several versions. Some ganglion cell axons carry information on form, movement, depth, and brightness, while other axons carry information on color and fine detail. Visual information is sent to the superior colliculi in the midbrain, where coordination of eye movements and integration of auditory information takes place. Visual information is also sent to the suprachiasmatic nucleus (SCN) of the hypothalamus, which plays a role in the circadian cycle. Choices: - density - weight - voltage - amplitude A:
(Answer)
amplitude

Ques: Q: What do angiosperms produce? Read this paragraph and choose the correct option from the provided answers: a phosphate group, which contains phosphorus and oxygen. Choices: - scales - needles - leaves - flowers and fruit A:
Ans: flowers and fruit

(Q).
Q: Energy transferred solely due to a temperature difference is called? Read this paragraph and choose the correct option from the provided answers: Heat and work are the two distinct methods of energy transfer. Heat is energy transferred solely due to a temperature difference. Any energy unit can be used for heat transfer, and the most common are kilocalorie (kcal) and joule (J). Kilocalorie is defined to be the energy needed to change the temperature of 1.00 kg of water between 14.5C and. Choices: - chemical energy - magnetic energy - humidity - heat A:
(A).
heat

Ques:Q: What membrane is populated by two types of photosystems that cooperate in the light reactions of photosynthesis? Read this paragraph and choose the correct option from the provided answers: Choices: - choroid - chloroplasts - subcutaneous - thylakoid A:

Ans:thylakoid

Q: On the atomic level, the dissolution of an ionic compound occurs when water interacts with the what in the crystal lattice? Read this paragraph and choose the correct option from the provided answers: The last property above requires some additional explanation. We are all familiar with the process of dissolution on a large scale. If you stir a spoonful of salt into a glass of water, the salt crystals are broken down and seem to disappear into the water. On the atomic level, the dissolution of an ionic compound occurs when water interacts with the ions in the crystal lattice, causing the lattice to break apart ( Figure below ):. Choices: - atoms - fractals - particles - ions A:
ions