Exam (elaborations)
NAS 2 CHALLENGE TEST/89 QUESTIONS AND ANSWERS 2024
- Course
- Institution
NAS 2 CHALLENGE TEST/89 QUESTIONS AND ANSWERS 2024
[Show more]
Seller
Follow
Victorious23
Reviews received
Content preview
NAS 2 CHALLENGE TEST/89 QUESTIONSAND ANSWERS 2024
purpose of the scientific method - -an organized way to solve a problem or
answer a question
-independent variable - -a variable that the researcher controls and is not
affected by other variables
ex: amount of water a plant receives
-What are the steps of the scientific method? - -1. question
2. Hypothesis
3. experiment
4. observation
5. analyze
6. conclusion
-dependent variable - -a variable that depends on other factors or variables
ex: how much the plant grows
-control group - -group that does not receive any treatment and is used to
compare or measure the other subjects
-experimental group - -group that receives treatment in an experiment
-what are the six levels of organization - -chemical, cellular, tissue, organ,
organ system, organism
-identify the requirements of life - -response to stimuli, reproduction,
metabolism, cellular organization, regulation, growth and development,
homeostasis
-identify survival needs - -oxygen, nutrients, water, body temperature,
atmospheric pressure
-define homeostasis - -body maintains a stable internal environment while
adjusting to external conditions
-Receptor - -a sensor that monitors the environment and responds to
changes (called stimuli) by sending the information to the control center
-control center - -determines the set point (level or range a variable is to be
maintained at), analyzes the information it receives, and determines the
appropriate response.
, -effector - -provides the means for the control center's response to the
stimulus
-negative feedback mechanisms - -a feedback mechanism that slows or
stops a process. Reduces the effect of the stimulus which decreases
productivity
ex: the control of blood sugar
-positive feedback mechanisms - -a feedback mechanism that results in the
enhancement of the original stimulus so the activity is accelerated
ex: childbirth (if childbirth takes too long the life of the mother and baby are
at risk)
-protons - -positive, in the nucleus
-electron - -negatively charged particle in the outer shell
-neutron - -neutral charge, in the nucleus
-number of protons is the same as? - -the number of electrons
-what is the atomic number equal to - -number of protons (atomic number
is top left above atomic symbol)
-atomic mass - -the same as the protons and neutrons added together (at
the bottom below atomic symbol)
-characteristics of ionic bonds - -between metal and nonmetal, high melting
and boiling points, generally solid at room temp, hard/brittle, conducts
electricity, dissolves in water, gives up one or more electrons to another
atom
-characteristics of covalent bonds - -between nonmetal only(metalloids),
atoms share electrons, lower melting and boiling point, usually liquid and gas
at room temp, soft, not a conductor of electricity, insoluble (don't dissolve)
-characteristics of hydrogen bonds - -more of an attraction than a bond,
generally weak bond, always include hydrogen that is already part of a polar
molecule
ex: water
-non-polar covalent bond - -electrons are shared equally between two
atoms
-polar covalent bond - -unequal sharing of electrons between two atoms
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Victorious23. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79650 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now