HSC Biology Question Thread

[Sanaz]

is random segregation and independent assortment the same thing?

nope

1. Segregation: Alleles separate during meiosis and random go into a gamete. Then they randomly combine during fertilisation.

2. Independent assortment: Traits in an organism independently get passed onto the successive generation. So just because the F1 generation has a tall yellow plant and a short green plant, it doesn't mean that the offspring, will be either tall and yellow or short and green. It could be short and yellow for example. Each gene for each trait gets inherited independently.

[kevin217]

Hi!
I'm kinda confused on the larynx and the pitch it produces. When its a high pitch will the vocal chords be longer and the gap between the vocal fold is smaller? and vice versa for low pitch?
thankkksss

I don't know about the vocal chords being longer, but they are more stretched/tighter and yes there is a smaller gap. Also important to know that when air is pushed from the lungs, the vocal chords will vibrate quickly to produce a high pitch sound.

[Skidous]

Hi!
I'm kinda confused on the larynx and the pitch it produces. When its a high pitch will the vocal chords be longer and the gap between the vocal fold is smaller? and vice versa for low pitch?
thankkksss

It's easier to not think about the gap but the actual vocal chords themselves

When the vocal cords are stretched tight, a higher pitch is created as the air that rushes past them from the lungs vibrates them at a higher frequency and vice versa for low pitch. If the vocal cords are not being stretched there is no vibration and hence No sound

[atar27]

if asked a question about models for enzyme specificity, would I just talk about the induced fit model because its the more correct one or would I need to mention the lock and key as well?

If it asks for one example of an enzyme model then you talk about the one you want but if it asks about both then you need to talk about both the induced for and the lock and key model.
Hope this helps

[atar27]

By the way do we need to know the diagrams for meiosis and mitosis?

[Skidous]

Just wanna make an announcement, I know the exam is tomorrow and you all may be stressed but there is one thing important about this day

SLEEP

if you don't get a good nights rest you will be very tired the next morning, half the exam is actually performing well in the exam room whilst the other half is preparation

Also your brain retains information better if you get some rest the day before a big test.

Don't be one of those people who crams the whole night up until 3am, get to sleep and wake up heaps early to do study before then

Good Luck to all you guys, I know we can all smash out these exams and show the HSC whose boss

[:3]

By the way do we need to know the diagrams for meiosis and mitosis?

Its possible they may show you a diagram of meiosis and ask you a question relating to what is happening.
_______________________________________________________________________________________________________________________

Also, what are the features of an epidemiological study?

[Skidous]

By the way do we need to know the diagrams for meiosis and mitosis?

If you need a diagram then it would be good to know one but as long as you know the process you should be ok.

The only diagram question I saw in the past was one where you had to fill in the step on crossing over during meiosis and the end gametes of the daughter cells

[Skidous]

Its possible they may show you a diagram of meiosis and ask you a question relating to what is happening.
_______________________________________________________________________________________________________________________

Also, what are the features of an epidemiological study?

The features of an epidemiological study is
1. Long time span
2. Large Sample size
3. Demographics (Age, Sex, Religion, Socio-economic status etc)
4. Nutrition/Lifestyle of the participants
5. A potential cause for a non-infectious disease
6. A notable change in rate of infection and deaths after removal of potential cause
7. A cause and effect link being established

[Sanaz]

What is the trend for long response questions (the one at the end) ?

[Skidous]

Its possible they may show you a diagram of meiosis and ask you a question relating to what is happening.
_______________________________________________________________________________________________________________________

Also, what are the features of an epidemiological study?

To better my response
 Epidemiology: is the study of the incidence of diseases or risk factors involved in its occurrence, prevalence and spread within a population.The main features of epidemiology include:» The cause of the disease» How it is transmitted» Who is at risk» Method of treatment and control» Long-term measures of prevention» Virulence of the strain and whether itchanges over time

[:3]

What is the trend for long response questions (the one at the end) ?

Often they ask you about either: technologies and increased understandings (i.e. scientist's contributions) and the implications it has for society and the environment.

Note: they may be specific in regards to the technologies/understandings that should be included (i.e. 2015 = kidney, other ones about reproductive technologies/genetic diversity, natural selection etc).

Also, cheers Skidous.

[Skidous]

What is the trend for long response questions (the one at the end) ?

The trend usually lend to heavy content dot points such as the work of scientist on a specific part of the syllabus, a Prescribed Focus Area, a development within fields or technologies

Sometimes a table may appear which can be worth 8-marks

Sometimes they will be describe but you're generally going to get Explain, discuss, analyse, evaluate or assess questions

Just remember to deconstruct the question and see what it is asking you before you begin to brain dump all the information you have

[:3]

If you mean by communication, I often see the Cochlear implant/hearing aids.

[Skidous]

Often they ask you about either: technologies and increased understandings (i.e. scientist's contributions) and the implications it has for society and the environment.

Note: they may be specific in regards to the technologies/understandings that should be included (i.e. 2015 = kidney, other ones about reproductive technologies/genetic diversity, natural selection etc).

Also, cheers Skidous.

Whilst this is true you can always get a PFA such as the nature and practice of biology which can lead you to a massive loss in marks (like the question some people got in trials for CSSA papers)