Answer:
In the absence of decomposers, soil, air, and water would not be replenished, and all the nutrients present would soon get exhausted. Hence, the cyclic process of life and death would be disrupted and life would come to an end.
By diffusion. Diffusion means the net movement of materials from a region of higher concentration to a region of lower concentration down the concentration gradient
Answer: Eating excessive quantities of such molecules could deregulate this process, increasing methylation and repressing the expression of genes that should normally be expressed.
Explanation:
DNA methylation is one of the epigenetic mechanisms involved in the regulation of gene expression, because it is a process by which methyl groups are added to DNA.
Methylation then modifies the function of DNA when it is found in the promoter gene, it is essential for normal development and is associated with a number of key processes, including genomic imprinting, inactivation of the X chromosome, repression of repeating elements, aging, and carcinogenesis. Usually, <u>it acts to suppress gene transcription.</u>
For example, folic acid is essential for the rapid cell division that occurs during early fetal development and it also plays an important role in methylation and thus in gene regulation. <u>The metabolism of these vitamins is aimed at achieving adequate levels of DNA methylation, necessary for the cellular processes</u>. Eating excessive quantities of such molecules could deregulate this process, <u>increasing methylation and repressing the expression of genes that should normally be expressed</u>.
Answer:
1. label the molecule below:
-1 ) phosphate group
-2)ribose
-3) adenine
2. Label ATP/ADP cycle:
(label 'em clockwise)
- ATP
-Water
- Phosphate
-ADP.
Answer:
The key steps to urine formation have been outlined in the attached file (flow chart diagram). Key components highlighted.
Explanation:
GLOMERULAR FILTERATION
The kidney consists of NEPHRONS, which consist of a network of capillaries (surrounded by the Bowman’s capsule), called GLOMERULUS. Water and solutes are filtered from the blood in the capillaries into the capsule through a filtration membrane.
The HYPOTHALAMUS in the brain secretes VASOPRESSIN A.K.A ANTIDIURETIC HORMONE (ADH). The ADH passes through the PITUITARY GLAND into the bloodstream and serves to regulate the blood pressure and water levels the kidney absorbs.
REABSORB VITAL NUTRIENTS
While larger cells and proteins are retained in the bloodstream, glomerular filtrate (fluids) flows into the RENAL TUBULE where reabsorption of essential substances that may have escaped the membrane, are taken in through the convoluted tubule.
SECRETION AND EXCRETION
Waste ions are also passed into the renal tubule in a process called Secretion. UREA is also released into the blood stream and to the tubes, after being broken down by the LIVER. All waste mixes with the filtrate to form urine.
Urine is collected in a duct, and passed out of the kidney in the ureter and the excreted from the bladder.
